TENNEKES, M. tmap: Thematic Maps in R. Journal of Statistical Software, [S. l.], v. 84, n. 6, p. 1–39, 2018. DOI: 10.18637/jss.v084.i06. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v084i06. Acesso em: 25 jan. 2022.